Do I have enough substrate?

wtusa17

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I have 20lb of fine gravel. I’m dirting my 20 long. Is it enough to have a cap? I want an inch at the front and an inch and a half at the back. Should I go and buy one 5lb bag to be safe?
 

mbsqw1d

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I have 20lb of fine gravel. I’m dirting my 20 long. Is it enough to have a cap? I want an inch at the front and an inch and a half at the back. Should I go and buy one 5lb bag to be safe?
What are the dimensions of your tank?
 
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